<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 表单验证区域 -->
            <el-form ref="loginFormRef" label-width="0px" :rules="loginFormRule" :model="loginForm" class="login_form">
                <!-- 用户名 -->
                <el-form-item prop="username">
                    <el-input  prefix-icon="el-icon-user-solid" v-model="loginForm.username"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item prop="password">
                    <el-input  prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
                </el-form-item>
                <!-- 提交按钮 -->
                <el-form-item class="btns">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="danger" @click="resetLoginForm">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>
<script>
export default {
  name: 'Login',
  data () {
    return {
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //   表单验证规则
      loginFormRule: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '请输入3到10位的用户名', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 152, message: '请输入6-12位的密码', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 表单重置
    resetLoginForm () {
      // 重置表单需要拿到表单对象，使用ref拿到表单对象，使用element-ui
      // 提供的resetFields()方法来重置表单
      this.$refs.loginFormRef.resetFields()
    },
    // 登录验证
    login () {
      // 验证表单数据是否合法？需要拿到表单对象使用validate()方法
      // 不同的是validate()方法后续操作需要在回调函数中展开返回true/false
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        console.log(res)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')
        // 将登录成功用户的token存放在sessionStorage上
        // sessionStorage和localctionStorage的区别
        // sessionStorage只在登录期间有效，locatioStorage一直有效
        window.sessionStorage.setItem('token', res.data.token)
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style lang="less" scoped>
.login_container{
    height: 100%;
    background-color: #2b4b6b;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    .avatar_box{
        width: 130px;
        height: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background: #eee;
        }
    }
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
}
</style>
